I used a Sony SmartWatch for a while (I believe you and I discussed it via email a while back) and while it seemed like a good idea, the execution fell short. It did allow me to glance surreptitiously at my wrist whenever my phone vibrated, instead of pulling the beast out to check the screen, but between the terrible battery life and the overall bulkiness of the large watch on my large wrist, it ended up being a waste of time.

I'm really glad I didn't pay for it ("healthy living" insurance reward in the form of an Amazon gift card), and right now it's on semi-permanent loan to a friend who was curious about the concept of a smart watch. I don't miss it, but if someone out there could get the concept down to a manageable size, with a month-long battery, for $100 or less, I'd be interested enough to give it another go.